Regular Expressions 101

^start of line

Negative Lookahead(?!.*?\/form\/)

.*?any character (except for line terminators), repeated any number of times

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

formthe literal text form (case sensitive)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

.*any character (except for line terminators), repeated any number of times

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

txtthe literal text txt (case sensitive)

$end of line

Global pattern flags

g modifier: global. Finds all matches instead of stopping after the first

m modifier: multiline. Causes ^ and $ to match the start and end of each line, not only the start and end of the string

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

^(?!.*?\/form\/).*\.txt$

New

Should match:
/vol/form.txt
/a/b/c/d/form.txt
/vol/var/hello.txt
./f.txt
./x/x.txt
/tmp/test/f.txt
/tmp/test/x/x.txt

Should NOT match:
/vol/form/various.txt
/form/athrird.txt
/a/b/c/d/form/forth.txt
/vol/var/sender.py
./form
./form/xxx.txt
./x
/tmp/test/form/xxx.txt

Regular Expression

Extraction